GNU bug report logs - #71591
30.0.50; PGTK: Terrible input lag with display scaling

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Jarno Malmari <jmalmari <at> ftml.net>, Po Lu <luangruo <at> yahoo.com>
Cc: 71591 <at> debbugs.gnu.org
Subject: bug#71591: 30.0.50; PGTK: Terrible input lag with display scaling
Date: Thu, 27 Jun 2024 10:42:55 +0300

> From: Jarno Malmari <jmalmari <at> ftml.net>
> Date: Sun, 16 Jun 2024 15:26:13 +0300
> 
> With a 4k display and 150 % display scaling there is a noticeable input
> lag when moving the point around in fullscreen. Very sluggish
> feel. Shrinking the window helps.
> 
> Besides "sluggish feel" I couldn't figure out easily measurable metric
> for this. One way is to clock how long it takes to use your keyboard
> repeat with `next-line' to reach the end of a couple pages long buffer.
> 
> This was tested with PGTK build on KDE Plasma 6 running Wayland. X build
> running in XWayland does not have this problem even if configured to be
> "Scaled by the system" from the system display configuration UI.
> 
> The scale option that affects this can also be changed with these commands:
> 
>     kscreen-doctor output.${OUTPUT_NAME}.scale.1.5
>     kscreen-doctor output.${OUTPUT_NAME}.scale.1.0
> 
> Applies also to emacs 29.

Po Lu, any suggestions or ideas?

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